I'm sorry, but Nexus 7 slow charging is anything but a rare problem. Run a search maybe? Google doesn't care. It's not charger problem and it's not a cable problem. The problem is either software or charger circuit. I just don't have time to hack this POS hardware, software to get it working.
I also have the charging problem on my original Nexus 7 as well as other headaches -- no TRIM support with encrypted partitions, super slow. Not really using that Google garbage anymore. Bought iPad Mini with retina and never looked back. I guess I'm too old for this hacking shit to get it working.
It's not just Nexus 7. Google seems to fuck up everytime they do a software update. I also have Nexus 4 and after 5.1 OTA upgrade device displayed error and was bricked. Not an issue for me as I can just go and install factory image wia fastboot but I did a search and a lot of users are hitting this issue and they don't know anything about fastboot or installng android sdk just to fix Googles failure to QA crap they are releasing.
Wi-Fi stopped reconnecting in sleep mode since 5.0 on my Nexus 4. It just seems that Google keeps breaking functionality with every update.
I actually opened an issue in their tracker for this as it kinda is important for me https://code.google.com/p/andr...
I'd go back to 4.4.4 but of course they had to make encrypted data partition backwards incompatible.
I'm not buying an Android device ever again.